I have a couple questions, when trying to fix issue #1, I created a new one. 1). In my kitchen I have a two sink setup, one sink has a garbage disposal. When the garbage disposal is ran the water backs up into my other sink before finally draining out. When the disposer is not in use the sink drains fine. The setup below the sink is a center outlet drain going through a diverter "T" into the pipe leading to the trap. I took this apart this evening and replaced the diverter "T", and made sure the pipes were level, but still the same issue. Any ideas to stop this would be greatly appreciated. 2). When trying to repair the above issue , all these parts are chrome plated brass 1 1/2 inch. I was trying to loosen the coupling on the waste arm that goes toward the wall, but instead of the coupling coming loose the whole piece came out. The coupling from the waste arm went into a piece that was threaded on one end, and reduced in diameter at the other other end to fit into another pipe coming from the wall(no coupling or anything). When I ran the disposer to test it, it leaked at the point where the reduced end went into the pipe coming from the wall. Where the pipe slides inside the one coming from the wall there are a couple drops of a hard gray substance in a couple places, which I have no idea what it is, but may have been some kind of sealant maybe? Any idea what I can do to stop this leak, and what I would call the pipe that slide inside the other pipe in the wall(I think it may need to be replaced). Any assistance would be greatly appreciated. Thanks S. Gregg